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For the files org/netbeans/libs/javacapi/javac-library.xml and org/netbeans/jackpot/jackpot-library.xml the nbinst URL protocol should specify the CNB of the module owning the file in the host field, e.g. in place of jar:nbinst:///modules/org-netbeans-jackpot.jar!/ use jar:nbinst://org.netbeans.jackpot/modules/org-netbeans-jackpot.jar!/
The old Jackpot module is no longer maintained. There is a rewrite in progress at: http://bitbucket.org/jlahoda/jackpot30/wiki/Home